Changing signature of numeric_name from numeric_name(addrinfo *addr)

to numeric_name(const struct sockaddr *sa, socklen_t salen) to remove
dependency on addrinfo struct.

src/HttpServer.cc

@@ -1536,7 +1536,7 @@ int start_listen(struct ev_loop *loop, Sessions *sessions,
       new ListenEventHandler(sessions, fd, acceptor);
 
       if (config->verbose) {
-        std::string s = util::numeric_name(rp);
+        std::string s = util::numeric_name(rp->ai_addr, rp->ai_addrlen);
         std::cout << (rp->ai_family == AF_INET ? "IPv4" : "IPv6") << ": listen "
                   << s << ":" << config->port << std::endl;
       }

src/nghttp.cc

@@ -674,13 +674,13 @@ int HttpClient::noop() { return 0; }
 void HttpClient::on_connect_fail() {
   if (state == STATE_IDLE) {
     std::cerr << "[ERROR] Could not connect to the address "
-              << util::numeric_name(cur_addr) << std::endl;
+              << util::numeric_name(cur_addr->ai_addr, cur_addr->ai_addrlen) << std::endl;
   }
   auto cur_state = state;
   disconnect();
   if (cur_state == STATE_IDLE) {
     if (initiate_connection() == 0) {
-      std::cerr << "Trying next address " << util::numeric_name(cur_addr)
+      std::cerr << "Trying next address " << util::numeric_name(cur_addr->ai_addr, cur_addr->ai_addrlen)
                 << std::endl;
     }
   }

src/util.cc

@@ -688,9 +688,9 @@ bool numeric_host(const char *hostname) {
 
 // Returns numeric address string of |addr|.  If getnameinfo() is
 // failed, "unknown" is returned.
-std::string numeric_name(addrinfo *addr) {
+std::string numeric_name(const struct sockaddr *sa, socklen_t salen) {
   char host[NI_MAXHOST];
-  auto rv = getnameinfo(addr->ai_addr, addr->ai_addrlen, host, sizeof(host),
+  auto rv = getnameinfo(sa, salen, host, sizeof(host),
                         nullptr, 0, NI_NUMERICHOST);
   if (rv != 0) {
     return "unknown";

src/util.h

@@ -418,7 +418,7 @@ void write_uri_field(std::ostream &o, const char *uri, const http_parser_url &u,
 
 bool numeric_host(const char *hostname);
 
-std::string numeric_name(addrinfo *addr);
+std::string numeric_name(const struct sockaddr *sa, socklen_t salen);
 
 // Opens |path| with O_APPEND enabled.  If file does not exist, it is
 // created first.  This function returns file descriptor referring the